Year	Percent change (Units)
1991	6.565
1992	4.759
1993	4.745
1994	5.590
1995	5.648
1996	3.190
1997	3.754
1998	2.755
1999	2.830
2000	1.689
2001	2.881
2002	1.600
2003	4.462
2004	1.256
2005	3.474
2006	3.357
2007	5.104
2008	4.084
2009	4.136
2010	3.480
2011	3.448
2012	5.373
2013	5.225
2014	4.444
2015	3.819
2016	4.217
2017	6.154
2018	7.493
2019	6.078
2020	4.881
2021	6.606
2022	10.089
2023	8.114
2024	7.241
2025	6.683
2026	7.282
2027	7.773
2028	8.592
2029	8.994